Naslov
Selective bong breaking in amorphous hydrogenated silicon by using Duke FEL

Autori
Gracin, Davor ; Vlahović, Branislav ; Borjanović, Vesna ; Sunda-Meya, A. ; Paterson, T. ; Dutta, J. M. ; Hauger, S. ; Pinayev, I. ; Ware, M. E. ; Alexson, D. ; Nemanich, R. J. ; Roedern, B. von

Izvornik
Nuclear Instruments and Methods A (0168-9002) 475 (2001); 635-640

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
a-Si:H ; structure ; ordering ; FEL ; recrystallization ; Raman spectroscopy

Sažetak
In order to study the possibility of influencing the phase containing predominantly Si– H bonds, while having minimal influence on the surrounding materials, samples of a-Si were exposed to Duke-FEL Mark III radiation. The wavelength of the radiation was selected to fit the absorption maximum of stretching vibrations of Si– H bonds (5 μ m). By varying the wavelength in the vicinity of 5 μ m, the illumination time and the power density, different types and degrees of structural ordering, of Si– H bonds and Si– Si bonds were obtained, and monitored by Raman spectroscopy. By increasing the energy density, at certain level the crystallization occurs. We were able to demonstrate a direct correlation between short and intermediate range ordering and the wavelength and intensity of the radiation. Using 5 μ m at 10 kW/cm2 leads to increase in structural disordering. However, increasing power to 60 kW/cm2 improves both short and intermediate order in a-Si:H, as demonstrated by Raman spectroscopy. Further increasing power density by an order of magnitude results in crystallization of the sample.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
FEL2000: Proc. 22nd Int. Free Electron Laser Conference and 7th F EL Users Workshop

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